Re-Os Dating of Molybdenite from the Yaogangxian Tungsten Deposit, South China, and Its Geological Significance

The Yaogangxian tungsten deposit is located in the central part of the Nanling polymetallicmetaHogenic province. The orebodies occur as veins. Wofframite and molybdenite are the dominantore minerals. Two samples were selected for molybdenite Re-Os dating in order to elucidate thetiming of mineralization. Re-Os datings of molybdenite from quartz-wolframite veins anddisseminated in granite yield ages of 153±7 Ma and 163.2±4.2 Ma respectively. The results indicatethat the Yaogangxian tungsten deposit is the product of large-scale metallogenesis in the middleYanshanian period in South China, and that the evolution from late magmatic to postmagmatichypothermal mineralization occurred at about I0 Ma. The rhenium content of molybdenite in theYaogangxian tungsten deposit suggests that the ore materials originated from the crust.